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Warrants to Acquire Shares of Common Stock - Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model (Details) - $ / shares shares in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 559 | 1,392
Other warrants (liability-classified) |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 13 | 13
Strike price (in dollars per share) | $ 7.50 | $ 7.50
Expected term (years) | 2 years 3 months 3 days | 2 years 9 months
Volatility % | 151.45% | 150.38%
Risk-free rate % | 0.30% | 0.16%

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- Definition Fair Value of Warrant Liability Assumptions Expected Term + References No definition available. + Details
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- Definition Warrant Strike Price + References No definition available. + Details
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- Definition Warrants Fair Value Assumptions Expected Volatility + References No definition available. + Details
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- Definition Warrants Fair Value Assumptions Risk Free Interest Rate + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- Details
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